Journal ArticleDOI
Classification, seasonality and persistence of low-frequency atmospheric circulation patterns
TLDR
In this article, Orthogonally rotated principle component analysis (RPCA) was used to identify and describe the seasonality and persistence of the major modes of interannual variability.Abstract:
Orthogonally rotated principle component analysis (RPCA) of Northern Hemisphere 1-month mean 700 mb heights is used to identify and describe the seasonality and persistence of the major modes of interannual variability. The analysis is detailed and comprehensive, in that 1) a high resolution, approximately equal-area 358-point grid is used for the virtually maximum possible 35-year period of record, 2) a positive bias in the NMC data base in the early 1950s in the subtropics is largely eliminated for the first time, and 3) homogeneous, separate analyses of each month of the year are carried out, detailing the mouth-to-month changes in the dominant circulation patterns. Winter results are similar to those of other recent RPCA and teleconnection studies except that some less obvious patterns are identified and further detail of the better-known patterns is provided. Two north-south dipole patterns are found over the Pacific Ocean (West Pacific Oscillation and East Pacific pattern) and over the Atla...read more
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Journal ArticleDOI
Influence of the sunspot cycle on the Northern Hemisphere wintertime circulation from long upper-air data sets
Yuri Brugnara,Yuri Brugnara,Stefan Brönnimann,Stefan Brönnimann,Jürg Luterbacher,Eugene Rozanov +5 more
TL;DR: In this paper, the authors present a study of the 11-year sunspot cycle's imprint on the Northern Hemisphere atmospheric circulation, using three recently developed gridded upper-air data sets that extend back to the early twentieth century.
Journal ArticleDOI
Seasonal changes in daily precipitation extremes in mainland Portugal from 1941 to 2007
Fátima Espírito Santo,Alexandre M. Ramos,M. Isabel P. de Lima,M. Isabel P. de Lima,Ricardo M. Trigo,Ricardo M. Trigo +5 more
TL;DR: In this article, the seasonal variations in the intensity, frequency and duration of extreme precipitation events in mainland Portugal were analyzed at the seasonal scale for daily data recorded in the period 1941-2007 at 57 meteorological stations scattered across the area, and the relationship between seasonal extreme precipitation indices and atmospheric large-scale modes of low-frequency variability was analyzed by means of a seasonal correlation analysis.
Journal ArticleDOI
Constructing Site-Specific Climate Change Scenarios on a Monthly Scale Using Statistical Downscaling
Radan Huth,Jan Kyselý +1 more
TL;DR: In this article, the authors used the ECHAM3 GCM to simulate surface temperature and precipitation with low accuracy, whereas the large-scale atmospheric fields are reproduced well; this justifies the downscaling approach.
Journal ArticleDOI
Solar cycle effects on modes of low-frequency circulation variability
TL;DR: In this paper, the rotational principal component analysis for low, moderate, and high solar activity was used to identify low-frequency variability in the 500 hPa heights in the Northern Hemisphere.
Journal ArticleDOI
An inverse relationship between aggregate northern hemisphere tropical cyclone activity and subsequent winter climate
TL;DR: In this paper, a robust inverse relationship between tropical cyclones (TCs) activity and NH winter climate is explored, and it is shown that TC-winter climate causality would not only argue for an elevated climate role of TCs, but would present an autumn predictability barrier given the limited skill in forecasting seasonal TC activity details.
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